Electron gun structure



March 5,1946. a K ET AL 2,396,014

ELECTRON GUN STRUCTURE Filed Oct. 30; 1943 7 I 7 49 I z WM INVENTOR;

l7 TTORNEY Patented Mar. 5, 194615 2,396,014 a ELECTRON eon STRUCTURE smiley J. Koch,'(llifton,'and Joseph H. Robillard,

East Orange; Nulnassignors to AlIen B -Du Mont-Laboratories, Inc.,Pas' saic,.N.-J a 'corpo ration of Delaware Application October 36, 1:943, Serial No. 508,324

' 19 Claims. (or. 250 158) This invention relates to' an electron gun and particularly to the waytheelectrical connections to the electrodes thereof are-made." In carrying out the invention. electrical connection is made. to one pair of deflecting plates through two pairs of spaced conductors mounted in insulating discs and to-the "other pair of such plates through two other pairs of spaced conductors-spaced from v .the first pair.

The conductors are spaced sufficiently far apart to avoid danger 'of leakage between the conductors. A support through which "potential 'is applied-to the grid of the gun is mounted" in the insulating discs. It is located between said pairs of supports, and provision is made for applying potentials to these and other electrodes of the gun in such a way that the danger of arcs or leakage is minimized.

The invention may be understood from the description in connection with the accompanying drawing, in which:

Fig. 1 is a side view;

Fig. 2 is a side view at right angles to Fig. 1;

Fig. 3 is a section along the line 33 of Fig. 1; and

Fig. 4 is a section along the line 44 of Fig. 1.

In the drawing, reference characters I and 2 indicate mica discs, and reference characters 3 and 4 indicate metal rods connected near their ends to said discs. Tubes 5 and 6 of ceramic material surround said rods between said discs. A cathode support I, a grid 8, a pre-accelerat ing anode 9, a first anode Ill, and a second anode II are connected by extensions or straps I 2 that are integral with the elements I to II onopposite sides thereof so that they may be attached in fixed positions to the tubes 5 and 6 and properly spaced from each other.

Pairs of metal rod supports I4, I4 and I5, I5 are anchored in eyelets I6 and I! (Fig. 1) located in holes through a mica disc I' with their upper ends rigidly secured to the lower edges of deflection plates I8 and Iii by metal straps 20 and 2I spot-welded to these plates. Similar pairs of shorter metal 'rods 22, 22' and 23, 23' are anchored in the disc I in the same way to support a pair of deflection plates 24, 25 in like manner. The pairs 01 supporting rods I4, I4, I5, I5, 22, 22', and 23, 23' have their upper ends anchored in metal eyelets fixed in place in the mica dis'c 26 which is smaller than disc 2|.

Discs I and 26 have spaced projections 21 with slots 28 therethrough for receiving anchoring projections that are on thin mica strips 29 and similar thin spring steel strips 30 in the known way to keep these strips in place so that the ends thereofwill b'e'prssed against the layer '0': conducting material that is provided on the inside surface or the neck of the g-lass'tube in which the device is to be'installed.

Metal rods 32,33 are anchored in metal eyelets in the discs I' and 2, the rod 32 being connected on'one side of mica disc I by lead 34 to rod 22.

The rod 33 is connectedby lead 35 on the other side of this disc to the rod 22', thus providing for application of deflecting potentials to the plates 24 and 25. The lower ends of these rods 32 and 33 are connected in the usual way to outside deflection potentials.

The metal rods 36 and 31 are similarly connected by leads 38 and 39, respectively, to the metal rods I5 and I5, thus providing for application of deflecting potentials to the plates I8 and I9 with the mica disc I between the leads 34 and 35.

The middle rod 40 is connected by lead 4| to one of the metal strips 30. This rod 40 is also connected by lead 42 (Fig. l) to the pro-accelerating electrode 9. The other metal strips 30 are connected by leads 4| and 42 to the second anode II.

Connections (not shown) are made from sources of proper potentials to pairs of rods 32, 33 and 36, 31 from deflection potential sources and to the rod 40 for high potential for the second anode. Other terminals are anchored in the eyelets 45, 46 and 41, from which leads 48, 49 and 50 extend to the cathode supporting ring 1, grid 8, and first anode I0, respectively.

Leads 5! and 52 extend from other eyelets 53 and 54 in disc 2 (Figs. 3 and 4) to the terminals 55 of the heater strip for the cathode 56 which is located inside the grid 8.

What is claimed is:

1. In an electron gun, fixed spaced discs of in-' sulating material, pairs oi. deflecting plates supported on one of said discs by pairs of conducting rods, and corresponding pairs of conductors having their ends anchored in said discs with the conductorsfor each pair adjacent each other.

2. The device of claim 1, in which electrical connections are provided between said rods and said plates and are located on opposite sides of one of said discs.

3. The device of claim 1, in which a pair of electrical connections is provided between the respective pairs of plates and rods. with one connection of each pair located on the opposite side of one oi. said discs from the other connection of the pair.

4. The device of claim 1, in which a metal strip is provided for high potential and another conducting rod for high potential is located between said pairs of conductors and is connected to said strip.

5. The device of claim 1, in which a metal strip is provided for high potential and another conducting rod for high potential is located between said pairs of conductors and is connected to a source higher potential than the other rods.

6. The device of claim 1, in which the farthest distance between any two of said rods is less than half the circumference of said disc. I

7. The device of claim 1, in which conductors are provided for applying low potentials to electrodesoi said gun are all located beyond the ends 01' the are occupied by said pairs of conductors.

8. The device of claim 1, in which conductors are provided for applying low potentials to electrodes of said gun are all. located beyond the ends of the are occupied by said pairs of conductors, and a conductor for the highest potential to be'applied to said gun is located between said pairs.

9. An electron gun, comprising discs of insulating material, diametrically opposite metal rods having their ends anchored in said discs, insulating material around said rods, electrodes supported on said insulating material, a pair of conductors with their ends connected to said discs, a pair 01 deflection plates supported on conductprs attached to the upper one of said discs, and leads on opposite sides 01' said upper disc extending from the respective conductors of said pair of conductors to two of said attached conductors, respectively.

10. The device of claim 9, in which a second pair of deflection plates, a second pair of conductors, and a second pair of leads on opposite sides of said upper disc are provided.

11. The device or claim 9, in which a second pair of deflection plates, a second pair or conductors, and a second pair of leads on opposite sides of said upper disc are provided with a conductor attached to said discs and located between said pairs of conductors.

12. The device of claim 9, in which a second pair of deflection plates, a second pair of conductors, and a second pair 01 leads on opposite sides of said upper disc are provided with a conductor attached to said discs and located between aosun said pairs or conductors, all of said conductors occupying an are less than a semicircle.

13. The device of claim 9, in which a second pair of deflection plates, a second pair of 'conductors, and a second-pair of leads on opposite sides of said upper disc are provided with a conductor attached to said disc and located between said pairs or conductors, an anode in said gun to which the highest potential is to be .applied, said last named conductor being connected to said anode.

14. The device of claim 9, in which a second pair of deflection plates, a second pair 01 conductors, and a second pair 0! leads on opposite sides of said upper disc are provided with a conductor attached to said discs and located between said pairs of conductors, an anode in said gun to which the highest potential is to be applied and also to a pre-accelerating electrode, said last named conductor being connected to said anode.

15. An electron gun, having all of its conductors to which high potential is to be applied located on one side of a longitudinal plane passing through the center of said gun.

16. An electron gun, having all of its conductors and the leads thereto to which high potential is to be applied located on one side of a longitudinal plane passing through the center of said 1'7. An electron gun, having all of its conductors and the leads thereto and therefrom to which high potential is to be applied located on one side of a longitudinal plane passing through the center of said gun.

18. An electron gun, having all of its conductors to which high potential is to be applied located on one side of a longitudinal plane passing through the center of said gun and all of its conductors to which low potential is to be applied located on the other side of said plane.

19. An electron gun, having all of its conductors to which high potential is to be applied located on one side of a longitudinal plane passing through the center of said gun, leads connected to said conductors and mica between said conductors wherever they cross each other.

STANLEY J. KOCH. JOSEPH H. ROBILLARD. 

